ADCs WITH FUNCTION AMPLITUDE (RF) DETECTOR DIGITIZING WIDEBAND MODULATING SIGNAL,WHAT ALLOW TO REFUSE APPLICATION DDC IN SDR RECEIVERS . INPUT SIGAL FOR THESE ADCs RF,OUTPUT SIGNAL DIGITIZING WIDEBAND MODULATING SIGNAL.SAMPLE FREQUENCY IT IS RF,THAT ALLOW
DIGITIZING ULTRA WIDEBAND MODULATING SIGNAL (1/2 RF BY NYQUIST THEOREM ).
THESE ADCs NOT DIGITIZING RF , WHAT SIGNIFICANTLY REDUCE REQUIREMENTS JITTER OF CLOCK.
I"M READY FOR DISCUSS.
If the questions are related to ADCs, this would be discussed in the High Speed Data Converter forum, not the Digital Radio (Digital Down Converter - DDC) (Digital Up Converter - DUC), Crest Factor Reduction - CFR, or Digital Predistortion DPD digital radio forum
There is a TI Application note that discusses IF or RF sampling frequency, and the sampling moment. There is a calculation for the highest signal slew rate and frequency, and the desired SFDR.
HI Radio Joe!
MY POST ABOUT PRINCIPLES OF CONSRUCTION SDR RECEIVERS.
USUALLY,IN SDR RECEIVERS DIGITIZING CARRIER FREQUENCY, WHAT LIMITED WIDEBAND AND REQUIRE MUCH RESOURSE (DDC, CLOCK GENERATOR WITH
MIN-JITTER,HIGH SPEED ADC).
I OFFER DIGITIZING INFOMATION OF WIDEBAND MODULATING SIGNAL,WHAT ALLOW TO AVOID THAT IMPERFECTIONS.
IT IS POSSIBLE IF USE ADC WITH FUNCTION RF(AM) DETECTOR.
In most cases the Radio Receiver provides either a heterodyne or homodyne approach, where the input is filtered to a band of interest, has one or several levels of real or quadrature mixing, and the mixer output(s) is(are) filtered. This analog radio mixing result is then fed into the Software Defined Radio ADC/ sampling module.
In most cases, the RF input has a linear dynamic range of more than 60db. This is discussed in the Data Converters SDR application report.
There are special conditions where the IF input to the digital tuner, is rectified (AM detected) prior to the Digital Down Conversion. This is used for frequency tracking, and certain types of signal level detection. In a Software Defined System, this can be done after the ADC so that both the signal and magnitude can be processed.
HI Radio Joe!
THANKS YOU FOR TUTORIAL (slaa407).
YOUR example ADC in undersampling mode have next main imperfections.1.ADC in undersampling mode create a few digitizing images of signal,that requre application complicated filters.2.High frequency of sample requre low jitter of clock generator.3.IN SDR of receivers requre much resourses (DDCs,filters). I designed ADCs with function RF(amplitude) detector.These ADCs is not digitizing RF,these ADCs digitizing wideband modulating signal with sample frequency =RF.Advantages these ADCs in direct conversion receivers and SDR of receivers.1.ADCs with function RF detector create only one digitizing image of wideband modulating signal. 2.IN these ADCs much less requirements for jitter of clock generator. 3.IN SDR of receiver is not requre DDCs. 4.Possibility ultra-wideband receivers 1/2 RF (by Nyquist theorem). I'm ready for discuss
The forum for high speed ADCs, would be under the High Speed Data Converter forum, or you can send a direct email to firstname.lastname@example.org.
Ken is the application manager for high speed data converters.
HI RADIO JOE!
I AM SORRY,BUT YOU GIVE ME NO THAT PERSON,
Please post your ADC comments to the High Speed Data Converter forum. If you have questions about after the ADC, with a specific Digital Radio Product. GC#### I can try to provide more assistance.
HI RADIO JOE !
I WILL WANT TO HAVE DISCUSSION WITH YIANNIS N. PAPANTONOPOULOS ,SISTEM AND APLICATIONS MANAGER,TI.
IT IS POSSIBLE ?
Yiannis is no longer the application manager for high speed data converters. The application manager is Ken Chan (email@example.com). The other suggestion is to post your
ADC input circuit discussion to the High Speed Data Converters e2e section. You can use a specific data converter like ADS5400 for the high speed reference
12bit 1Gsps ADC.
HI RADIO JOE!
I DO ATTEMPT CONNECTION WITH Mr.KEN CHAN AND SEND INFORMATION,BUT RECEIVE REFUSAL IN DISCUSSION ABOUT ADCs WITH FUNCTION RF DETECTOR...
ON TI E2E /HIGH SPEED ADC/ PLACED MY POST.
ADS5400 DIGITIZING RF ,I TRY TO DISCUSS DIFFERENT CONСEPTION.
Good luck with your concept. You could contact your local TI FAE. There is a TSW1200 capture card for the ADCs. You could capture some experimental data
with the input to the ADC processed, and post your results on the forum.
GENERALLY , ADCs WITH FUNCTION RF DETECTOR IS NOT CONCEPTION, IT IS REALY WORKING DEVICES.
ONE FROM ADVANTAGES OVER ADCs DIGITIZING RF ,I SHOW ON DRAWING.
HI RADIO JOE!
YOU SUPPOSE FORUM TI E2E NO PLACE FOR DISCUSSION NEW IDEAS ?
All content and materials on this site are provided "as is". TI and its respective suppliers and providers of content make no representations about the suitability of these materials for any purpose and disclaim all warranties and conditions with regard to these materials, including but not limited to all implied warranties and conditions of merchantability, fitness for a particular purpose, title and non-infringement of any third party intellectual property right. TI and its respective suppliers and providers of content make no representations about the suitability of these materials for any purpose and disclaim all warranties and conditions with respect to these materials. No license, either express or implied, by estoppel or otherwise, is granted by TI. Use of the information on this site may require a license from a third party, or a license from TI.
TI is a global semiconductor design and manufacturing company. Innovate with 100,000+ analog ICs andembedded processors, along with software, tools and the industry’s largest sales/support staff.